Improvement in milling tools



J.M..sur11n. i MILLING TdoLs.

Patented 06u17, 187s.

APHER. WASHINGTON D C shaft.

y ticularly for gumming saws.

UNTTED STA'I "Esg,L

4.'rOsEPH M. lsM1TH, oF nOcHEsTER, NEW YORK.

ATENT @Enron IMPROVEMENT IN MILLINGTOOLS.

Specification forming part of Letters VPatent'llo. 183,272, dated October-17,1876; application led l March 21, 1876.'

To all whom it may concern Be it known that I, JOSEPH M. SMITH, of the city of Rochester, in the county of Monroe and State of New York, have invented a certain new and useful Improvement in Milling- Tools 5 and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, in vwhichy Figure l is'a plan, partially in section, showingthe removable milling-tool attached to the Fig. 2 is a central section of the same on an enlarged scale. Figs. 3, 4, and 5 are end elevations of the milling-head, showing` various forms of the cutters. Fig. 6 is a view similar to Fig. 2, but showing a solid head. Figs. 7, 8, 9, and l0 are end elevations of the solid head, showing various forms of the cutters.

A is the milling-head. It is constructed with longitudinal grooves, in which are fitted the removable cutters a a. These cutters are made of hardened steel. In Fig. 3 they are shown of diamond shape in cross-section, the opposite sides being counterparts, and having two cutting-edges. This form enables them to be used either side out.

When one edge becomes dulled or worn the cutter may be reversed by simply slipping it out and inserting it the other way. Double the wear is thus obtained over a one-edged cutter. In Fig. 4 square cutters are shown. In Fig. 5 dovetailed cutters are shown.l The cuttingedges are the same in both instances last named, the difference consisting simply in the form of the body.

In Fig. 4 the cutters can be inserted and removed bodily at the face of the milling-head, while in Fig. 5 they have to be slipped end- Wise into or out of the grooves.

In Figs. l and 2 the milling-head is shown as removablefrom its shaftB,being constructed with a central eye, b, for passing over the shaft. The shaft has a shoulder, c, against which one end of the milling-head abuts. The opposite end of the shaft is made of smaller diameter, and on this rests a sleeve or collar, C, which is forced up to place against the end of the milling-head by a nut, 0l.

' The nut may be applied close up to the head, if desired. By this means the milling-head is clamped securely in place. on the shaft, so as to retain its place without slipping, and yet it can be removed from the shaft at any time for applying a larger or smaller one, or for any other purpose.

At each end of the milling-head are circular danges or rims D D. The inner faces of these rims are grooved out, so as to form shoulders f, which lit over the ends of the inserted cutters, as shown in Fig. 2. By this means the cutters are prevented from end movement, and are also \clamped ldown tightly in their grooves. They are, in fact, as tight and immovable as if formed solid with the head.

If desired, the shoulders f, which shut over p the ends of the cutters, may, one or both, be made slightly beveling to bind the cutters down as they are pressed inward. These anges have central eyes or holes which slide over the shaft. These flanges can be taken ol for the purpose of inserting or removing the cutters.

In Fig. 6 the milling-head is shown solid with the shaft. Figs. 7, 8, and 9 show the cutters of thesame kind before described, attached to the solid head. The anges or rims D D are also used; but in this case pins g g pass through the shaft on each side of the danges to hold the latter in place. One of these pins is slightly wedging, to produce the tightening action. Fig. I0 shows cutters of angular or wedging form, which center to the head or shaft. They are held by the flanges vD D, as before described. Other forms of insertible cutters may be used in the same manner.

The advantage of this invention is that, if one cutter becomes broken or injured, it can be replaced by anotheri without discarding the whole milling-head, which must be done where the cutters are formed solid with the head. The device is more easily and cheaply formed than a solid head, since the headV has l simply to be grooved, and the teeth can be cut from a bar formed for the purpose, whereas, iu the old form of solid teeth, the teeth y are dicult to form, having to be out out from the head.

` Another advantage arises from the employmweut of the shouldered flanges or rims D D,

` which serve to prevent endmovement of the teeth, and to clamp them rmly in place.

Another advantage consists in the construe tion of the shaft with the shoulder c and sleeve C, by which the milling-head may be applied' or removed at pleasure.

What I claim as new is 1. In a milling-tool, the insertible cutters a,

constructed of diamond shape in cross-section,

witnesses.

\ J. M. SMITH. Witnesses:

V. A. TUTTLE,

R. F. Oscoop. 

